期刊
THEORETICAL AND APPLIED FRACTURE MECHANICS
卷 109, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.tafmec.2020.102776
关键词
Yellow sandstone; Pre-existing surface crack; Uniaxial cyclic loading; Fatigue behaviour; Constitutive model
资金
- National Natural Science Foundation of China [11772358]
- Water Conservancy Science and Technology Major Project of Hunan Province, China [XSKJ2019081-10]
- Hunan Provincial Natural Science Foundation of China [2020JJ5715]
- State Key Laboratory for GeoMechanics and Deep Underground Engineering, China University of Mining and Technology, Xuzhou [SKLGDUEK1908]
- State Key Laboratory of Geohazard Prevention and Geoenvironment Protection of China [SKLGP2019K003]
- Changjiang River Scientific Research Institute, Wuhan, China [CKWV2019738/KY]
In engineering practice, rock masses are often subjected to cyclic loading. Under cyclic loading, the mechanical properties of rocks are significantly different from those under conventional loading conditions. The mechanical behaviour and fatigue of intact rock has been extensively studied. However, the mechanical fatigue properties of rock masses with surface cracks and related damage evolution models are not well understood. In this study, a series of fatigue damage tests were carried out on yellow sandstone specimens; five different pre-existing surface crack angles (0 degrees, 15 degrees, 30 degrees, 45 degrees and 60 degrees) and three different maximum cyclic stress levels (19.1 MPa, 25.6 MPa and 30.3 MPa) were considered. The results showed that with the increase in the number of cycles, Young's modulus gradually stabilized, while the secant modulus decreased non-linearly. The maximum strain and residual strain continuously accumulated. The influence of macro cracks on the damage of rocks was studied through the increase in strain energy. Based on the macro-micro coupling damage, a constitutive model was proposed for the fatigue test. The theoretical results were fitted with the experimental data, showing that the proposed model can effectively describe the fatigue damage characteristics of fractured rock masses. The research results have certain reference value for the long-term stability evaluation in fractured rock mass engineering.
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